03:45AM | 11/04/05
Member Since: 11/03/05
3 lifetime posts
I am trying to install (5) seperate 36" long (750 watts ea.) 220v electric baseboard

and intend to regulate from a double line break, line voltage thermostat. Had a svc. upgrade done recently and a line was run from svc. panel (double 20 amp breakers) to the thermostat and I am now at a point where I have the Load line side (L1 & L2) of the thermostat ready to connect to the units.

Confussion: Ran a 10/2 w/grd from svc panel to carry the anticipated 3750 combined watts of the 5 units. Have a basic wiring diagram that is somewhat confusing for wiring multiple units IN PARALLEL. I opened one of the baseboard units and notice that their wiring is of a stranded type and is only 14 gauge. Question: Can I continue wiring with 14 gauge from unit to unit or do I have to go with 10 guage solid wire? Can I run individual wires inside conduit or do I have to use NMB sheathed electrical cable. I do have other questions relating to the wiring diagram, but maybe someone can start with this popouri I just posted. Thanks for any anticipated help that maybe coming.



01:58PM | 11/04/05
Member Since: 04/25/05
1915 lifetime posts
For branch circuit wiring the miniumum wire size is based on the size of the breakers.

For 20 amps circuits that is #12. It might be upsized if the run is long or if the wire ampacity needs to be derated (unusal in residential wiring unless the wires/cables are in a bundle.

Wire inside equipment has completely different rules, and for several reasons.

You can run NM unless your local code prohibitis it. Chicago and some other cities in that area require conduit.


01:11AM | 11/06/05
Member Since: 11/03/05
3 lifetime posts
So now that I am going to run 12 guage from heater to heater, I want to run a surface wiremold/raceway because the area is a finished porch/deck and other access would involved ripping down exterior flooring to run wire thru joists & back into interior of porch. Any problem using PVC Conduit and running seperate 12 guage wires vs. 12/2 nmb thru it and what would be the consequences if specs call for 12ga wire thnn @125 degree from heater to heater and then into pvc conduit rated 90 degree max.


Will the 10/2 line from (2) 20amp breakers (220v) at the svc panel carry a total wattage of 3750. I believe that 4000 watts would be max minus 10% giving a safty margin of 3600 watts. Sounds borderline to me. Your thoughts.

Thanks again for the input.


05:27PM | 11/06/05
Member Since: 03/31/05
265 lifetime posts
The 10ga wire is rated for 30A. A 4000W heater at 240V only pulls 16.67A. You have plenty of safety factor.

"Any problem using PVC Conduit and running seperate 12 guage wires vs. 12/2 nmb thru it and what would be the consequences if specs call for 12ga wire thnn @125 degree from heater to heater and then into pvc conduit rated 90 degree max."

Thsi statement doesn't make sense. If you mean THHN wire, it is rated for 90C. NM-B cable should not be used in conduit except for physical protection. How far between each heater?


01:13AM | 11/07/05
Member Since: 11/03/05
3 lifetime posts
Average distance between units is approx 5 to 6 feet. Running #12 between units would be sufficient ???

One last ? The wiring link below from Marley co. illustrates factory wire hookups BUT I am confused on how to wire multiple units in parallel. Steps 7-9 are for remote thermostats only and that is my situation.

Steps 10-15 do not pertain to me , that is for hooking up with built in thermostats. Care to expand and simplify. Really appreciate your input and time. Thanks.
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